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Title: Performance of a 60 gram cryogenic germanium detector

Abstract

The authors have developed a 60 g particle detector which utilizes both the ionization and the photons produced by a particle interaction. Six NTD Ge thermistors are attached to a pure germanium crystal which has implanted contacts for drifting charge. The authors have operated our detector at 30 mK, and the authors have studied its response to irradiation by 18 and 60 keV photons from an 241 Am source. This paper presents an analysis of the resolution of our detector, considering the noise of the front end electronics, and signals from extraneous sources such as microphonics.

Authors:
; ; ; ; ; ;  [1]; ; ;  [2];  [3];  [4];  [5]
  1. (California Univ., Berkeley, CA (United States). Dept. of Physics)
  2. (Lawrence Berkeley Lab., CA (United States))
  3. (Lab. de Physique Corpusculaire, College de France, 75231 Paris (PR))
  4. (California Univ., Berkeley, CA (United States). Dept. of Materials Science and Mineral Engineering)
  5. (CEN-Saclay, 91191 Gif-Sur-Yvette (FR))
Publication Date:
OSTI Identifier:
5090362
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States); Journal Volume: 38:2
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; GE SEMICONDUCTOR DETECTORS; IRRADIATION; PERFORMANCE; RESOLUTION; AMERICIUM 241; CRYOGENICS; CRYSTALS; ELECTRONIC EQUIPMENT; IONIZATION; PHOTONS; THERMISTORS; ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; AMERICIUM ISOTOPES; BOSONS; ELEMENTARY PARTICLES; EQUIPMENT; HEAVY NUCLEI; ISOTOPES; MASSLESS PARTICLES; MEASURING INSTRUMENTS; NUCLEI; ODD-EVEN NUCLEI; RADIATION DETECTORS; RADIOISOTOPES; SEMICONDUCTOR DETECTORS; SEMICONDUCTOR DEVICES; SPONTANEOUS FISSION RADIOISOTOPES; YEARS LIVING RADIOISOTOPES; 440104* - Radiation Instrumentation- High Energy Physics Instrumentation

Citation Formats

Cummings, A., Wang, N., Shutt, T., Barnes, P., Lange, A., Sadoulet, B., Stubbs, C., Emes, J., Ross, R., Smith, G., Giraud-Heraud, Haller, E.E., and Rich, J. Performance of a 60 gram cryogenic germanium detector. United States: N. p., 1991. Web. doi:10.1109/23.289301.
Cummings, A., Wang, N., Shutt, T., Barnes, P., Lange, A., Sadoulet, B., Stubbs, C., Emes, J., Ross, R., Smith, G., Giraud-Heraud, Haller, E.E., & Rich, J. Performance of a 60 gram cryogenic germanium detector. United States. doi:10.1109/23.289301.
Cummings, A., Wang, N., Shutt, T., Barnes, P., Lange, A., Sadoulet, B., Stubbs, C., Emes, J., Ross, R., Smith, G., Giraud-Heraud, Haller, E.E., and Rich, J. 1991. "Performance of a 60 gram cryogenic germanium detector". United States. doi:10.1109/23.289301.
@article{osti_5090362,
title = {Performance of a 60 gram cryogenic germanium detector},
author = {Cummings, A. and Wang, N. and Shutt, T. and Barnes, P. and Lange, A. and Sadoulet, B. and Stubbs, C. and Emes, J. and Ross, R. and Smith, G. and Giraud-Heraud and Haller, E.E. and Rich, J.},
abstractNote = {The authors have developed a 60 g particle detector which utilizes both the ionization and the photons produced by a particle interaction. Six NTD Ge thermistors are attached to a pure germanium crystal which has implanted contacts for drifting charge. The authors have operated our detector at 30 mK, and the authors have studied its response to irradiation by 18 and 60 keV photons from an 241 Am source. This paper presents an analysis of the resolution of our detector, considering the noise of the front end electronics, and signals from extraneous sources such as microphonics.},
doi = {10.1109/23.289301},
journal = {IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States)},
number = ,
volume = 38:2,
place = {United States},
year = 1991,
month = 4
}
  • The authors have tested a new 60 gram germanium phonon and ionization detector to study incomplete charge collection effects in cryogenic detectors. An understanding of such effects is necessary to further improve the nuclear vs. electronic recoil discrimination capability of cryogenic detectors. The detector is operated at [approx] 20 mK. It has three concentric ionization channels, and four electric field shaping structures on its sides. Phonons are sensed using NTD Ge thermistors. First results obtained using this device and moveable radioactive sources of [sup 241]Am and [sup 57]Co will be presented.
  • The Multi-sensor Airborne Radiation Survey (MARS) detector is a 14-crystal array of high-purity germanium (HPGe) detectors housed in a single cryostat. The array was used to measure the astrophysical S-factor for the 14N(p,γ) 15O* reaction for several transition energies at an effective center of mass energy of 163 keV. Owing to the segmented nature of the MARS detector, the effect of gamma-ray summing was greatly reduced in comparison to past experiments which utilized large, single-crystal detectors. The new S-factor values agree within the uncertainties with the past measurements. Details of the analysis and detector performance will be presented.
  • The requirements for and benefits of cooling IR detectors are reviewed. Recent developments in Joule-Thomson cooler technology that address those requirements are discussed.
  • This article presents the performance of palladium-platinum core-shell catalysts (Pt/Pd/C) for oxygen reduction synthesized in gram-scale batches in both liquid cells and polymer-electrolyte membrane fuel cells. Core-shell catalyst synthesis and characterization, ink fabrication, and cell assembly details are discussed. The Pt mass activity of the Pt/Pd core-shell catalyst was 0.95 A mg –1 at 0.9 V measured in liquid cells (0.1 M HClO4), which was 4.8 times higher than a commercial Pt/C catalyst. The performances of Pt/Pd/C and Pt/C in large single cells (315 cm 2) were assessed under various operating conditions. The core-shell catalyst showed consistently higher performance thanmore » commercial Pt/C in fuel cell testing. A 20–60 mV improvement across the whole current density range was observed on air. Sensitivities to temperature, humidity, and gas composition were also investigated and the core-shell catalyst showed a consistent benefit over Pt under all conditions. However, the 4.8 times activity enhancement predicated by liquid cell measurements was not fully realized in fuel cells.« less